1 1AC 1-aminocyclopropanecarboxylic acid 1.000 2 ZPJ Cyclopropanecarboxylic acid 0.857 3 0Y9 (1r,2s)-1-amino-2-ethenylcyclopropanecarboxylic acid 0.778 4 XK7 1-aminocyclopropane-1-carboxamide 0.750 5 09V Cyclopropylmethanol 0.714